nyoj458 A*B Problem

题目链接：http://acm.nyist.net/JudgeOnline/problem.php?pid=485

利用了九余定理：参考 http://blog.youkuaiyun.com/niushuai666/article/details/6856109

#include<stdio.h>
int main()
{
    int m,n,d,t;
    char a[30];
    scanf("%d",&t);
    getchar();
    while(t--)
    {
        gets(a);
        int i=0;
        m=n=0;
        while(a[i]!=' ') m+=a[i++]-'0';
        while(a[++i]!='\0') n+=a[i]-'0';
        d=m*n;
        while(d>=10) d=d%10+d/10;
        printf("%d\n",d);
    }
    return 0;
}